Pulp mold of laminate structure



Oct. 30, 1928;

F. LOUSOT PULP MOLD 0F LAMINATE STRUCTURE llll Filed Oct. 8, 1927 CTI Patented Oct. 30, 1928.

PATET oFFIcE.

FELIX LOUISOT, OF HASBROUCK HEIGHTS, NEW JERSEY.

PULP MOLD 0F LAMINATE STRF'CTUBJEI.I

Application led. October 8, 1927. Serial No. 224,798.

This invention relates to laminated molds for forming articles from plastic material, paper or other pulp and similar materials.

An object of the invention is the provision of vmeans for expeditiously loosening a molded article 'from such a. mold.

According to .this invtntion, the laminas composing the mold are slidably mounted with respect to each other and means are provided for successively moving each lami-v na relative to the adjacent laminae. Minute channels are out in one surface of each lamina to provide means for applying suction to draw the pulp into the mold. These channels communicate with a chamber of relatively large volume which in turn is suitably connected with a vacuum pump or other suction means. With the laminas in their normal positions suction is applied and pulp sucked into the mold and formed into the j desired-shape. l.At the same time' the suction draws out from the pulp substantially all the iiuid content so that the molded article is comparatively dry. The suction is then stopped and the article removed from the mold. Such removal is facilitated by successively moving the laminas so that each lamina is individually moved out of engagement withthe molded article.' In this way the molded article is loosened from the mold without subjecting it toany pull .or strain.

@ther objects, novel features and advantages of this invention will'bc apparent from the following specilication and, accompanying drawings, `wherein Figure 1 is4 a vertical section through a mold embodying the invention, the lamina being in normal shape. j

Figure 2 is a similar section with the laminae in the `position assumed after being moved away from'the molded article.

Fig. 3 is a plan view of the mold, and

lFig. l is an enlarged perspective of one' of the laminas. j

10 designates a cylindrical .casing having at one end a disk-like cover 1l and at the other end a cover 12 formed with a boss 13. Within the casing 1() are provided annular guide or supporting members 14 and 15.v A pin 16 extends diametrically through the annular member 415 and across the aperture in such member.

A plurality of cylindrical concentric laminae 17 are arranged in the casin each lami-L na having at one end a pair o notches 18 Wii'ghin which isreceived the pin 16, Tha

-outer lamina contacts with ythe innersur-k faces of the cover l1 and the guide members let and 15. These laminas are of difierent length so that their upper ends define a mold of any desired' shape. A pin 19 is containedwithin the inner lamina and is likewise provided with a notch 18 receiving the pin 16. rllhe upper end of this pin may project slightly into the mold cavity formed by the ends of the laminae 17. As clearly shown in Fig. Il, each of the laminae is cut away to form a notch 17a, the ends of the notch being diametrically opposite each other. Each notch is of greater height at one end than at the other end. The pin 19 is provided with a transverse groove 19a, the upper Jface of which is oblique so that one end of the groove is equal in height to the lower end of the notches and the other end thereof is of a height equal to the other ends of the notches. A plunger 2() having offset ends connected by an oblique portion 21 extends across the casing 10 andy passes through the notches in the laminae and the groove in the pin 19. The plunger is equal in thickness to the height oit the lower end of the notches in the laminae and is likewise` less in thickness than the height of the opposite ends of the notches. When the plunger is in the position shown in Fig. 1 the laminae and the pin 19 are in such position that their ends define the desired mold cavity. As the plunger 20 is moved to the` position shown in Fig. 2 the lower face of the oblique portion 21 successively engages the lower edge of the notches 17a, thus moving each lamina successively with respect to each other and with respect to the post 19, their upperends being thus moved out of Contact with the article molded in the cavity. Further movement of the pin 20 will move the plunger 19 and rearrange the laminae as they were originally exceptat a 4slightly lower level.

Adjacent the upper ends of the laminae 17 are provided peripheral grooves 22. From these grooves to the upper ends ofthe laminae are provided very line longitudinal channels 23 cut in the surface of the laminae. Below the grooves 22 the laminas are formed with a plurality of flat faces 2li which define with the inner surface ot the surrounding lamina a plurality of longitudinal channels.

y passes fits snugly around vthe plunger. It

desired, suitable packing means may be provided around the plunger in order that the leakage of air thereinto may not interfere with the operation of the mold.

With the laminae in the position shown in Fig. 1 the suction means are started and pulp introduced into the mold cavity formed by the ends of the laminas. The pulp is drawn into proper position to form the desired article by the suction in the channels 23 and the major portion of the liquid content of the pulp is likewise drawn out through said channels. In this Way the molded articles shown in dotted lines in Fig. 2 is produced. The suction is theh turned off and the plunger 20 moved to the position shown in Fig. 2 orbeyond such position. As the plunger is moved it causes the various laminas successively to slide relative to each other so that the molded article is loosened from the mold. The plunger may be moved only part Way or all the Way but in any event the molded article is loosened. The plunger 20 is then returned into normal position and the operation repeated.

c The minute channels 23 communicate With. the relatively large chamber 22, thus making highly effective the action of the channels in drawing the pulp into proper position by suction. This chamber 22 communicates With channels of larger area than the channels 23, thus insuring that at all times during the operation of the device there is a relatively high degree of vacuum in the chamber 22. This is due to the fact that air can be drawn out of the chamber 22 fasterthan it can be admitted to it through minute channels 23. Preferably the channels 23 increase both in depth and in Width from the edges of the laminae to the chamber 22. This permits the ready removal from the channels of any fiber Ithat may have been drawninto the mouths thereof. @logging of the channels by liber is prevented by this arran ement. y

-T e provision of minute channels extending longitudinally of the lamina; effectively prevents accumulation of fibers at the edges of the laminas. There is no tendency for the bers to get together at the edges'as there is in the case of the prior art molds having suction grooves formed by cutting back alternate laminas. Moreover this arrangement gives to the articles a smoother finish than 1s possible With the prior artk molds as the edges of the laminas may be shaped to present a surface free of ridges or depressions. i'

It is of course understood that although the mold has been'disclosed yas emloodyinv`- may be made out.of and moved relatively to each other 1n a similar manner CQ disengage a molded article from the mold formed by the laminae. Moreover, it is apparent that various structural modifications may be made Without in any way departing from the spirit of the invention as defined in the appended claims.' v

What I claim is:

1. In combination, a plurality of slidable laminas, said laminae having their edges delininga mold cavity and being provided With intervening channels and means for successively moving said laminae relative to each other.

2. In combination, a plurality of slidable laminae, said laminae having their edges delining a mold cavity and being provided with intervening channels, notches provided in said laminas and means. successively to engage the edges of said notches to move said laminae relative to each other.

3. In combination, a plurality of coaxial cylindrical slidable laminae, said laminae having their edges defining a mold cavity and beingl provided with intervening channels, and means for successively moving said laminas relative to each other.

4. In combination, a plurality of coaxial cylindrical slidable laminas, said laminae .y having their edges delining a'mold cavity and being provided with intervening chan- Cil each other, said laminas having their edges deiining a mold cavity and being provided with intervening channels, and means lfor successively moving said laminae relative to each other and to said post.

6. In combination, a post, a plurality of cylindrical laminae coaxial with said post and slidable relative to said post and to each other, said laminas having their edges defining a mold cavity and being provided with intervening channels, notches formed in said laminas and said post and means successively to engage the edges of said notches and said post for moving said laminas relative to each other and to said post. I

7 In combination, a casing, a plurality of cylindrical laminae slidably mounted in said casing, said laminae having their edges deining a mold cavity and being provided with intervening channels, notches formed in said laminae, and a plunger extending across said casing and through said notches, said plunger having an oblique portion to g 'engage the edges of said notches for succescyllndrlcal laminae, laminas of other typesw sively moving said laminee relative to each fother.

minute channels formed in one face of each lamina and leading from the edge thereof to a relatively large groove spaced from the edge of the lamina, and relatively large channels leading from said groove.

9. In combination, a plurality of coaxial cylindrical laminae, a peripheral groove in each lamina spaced from the edge thereof, longitudinal minute' channels leading from said groove to the edge of the lamina and flat surfaces leading from said groove to the opposite end of said lamina.

10. In combination, a casing, a plurality of coaxial cylindrical lalninae mounted in said casing, each lamina having a peripheral groove spaced from one edge thereof, longitudinal minute channels leading from said groove to said edge and flat surfaces leading from said groove to .the opposite end of the lamina, and means for connecting said casing with suction.

l1. In combination, a casing, a plurality tudinal minute channels leading from said groove to said edge and lat surfaces leading from said groove vto the opposite end-of the lamina, means for moving said laminae successively relative to each other and means for connecting said casing with suction means.

l2. In combination, a casing, a plurality of coaxial cylindrical laminae mounted in said casing, eachlamina having a peripheral groove spaced from one edge thereof, longitudinal minute channels leading from said groove to said edge and flat vsurfaces leading from'- said groove to the opposite end of the lamina, said lamina having notches, a member extending across said casing and' through said notches, said member having an oblique portion to engage the edges of said notches Vfor successively moving said laminae relative to each other and means for connecting said casing with suction means.

In testimony whereof, I have signed my name to this speciication.

FELIX Loursor. 

